diff --git a/vlib/encoding/base64/base64.c.v b/vlib/encoding/base64/base64.c.v
index 1e912e933f..886e6f7534 100644
--- a/vlib/encoding/base64/base64.c.v
+++ b/vlib/encoding/base64/base64.c.v
@@ -129,7 +129,7 @@ fn decode_from_buffer(dest &u8, src &u8, src_len int) int {
 				u8(index[d[si + 2]]), u8(index[d[si + 3]]), u8(index[d[si + 4]]), u8(index[d[si + 5]]),
 				u8(index[d[si + 6]]), u8(index[d[si + 7]]))
 
-			// Reading out the individual bytes from the u64. Watch out with endianess.
+			// Reading out the individual bytes from the u64. Watch out with endianness.
 			$if little_endian {
 				b[n_decoded_bytes + 0] = datablock_64.data_byte[7]
 				b[n_decoded_bytes + 1] = datablock_64.data_byte[6]
diff --git a/vlib/v/gen/js/comptime.v b/vlib/v/gen/js/comptime.v
index a7f04ff83d..0bf772a2f4 100644
--- a/vlib/v/gen/js/comptime.v
+++ b/vlib/v/gen/js/comptime.v
@@ -303,10 +303,10 @@ fn (mut g JsGen) comptime_if_to_ifdef(name string, is_comptime_option bool) !str
 		}
 		// endianness:
 		'little_endian' {
-			return '(\$os.endianess == "LE")'
+			return '(\$os.endianness == "LE")'
 		}
 		'big_endian' {
-			return '(\$os.endianess == "BE")'
+			return '(\$os.endianness == "BE")'
 		}
 		else {
 			if is_comptime_option
diff --git a/vlib/v/gen/js/js.v b/vlib/v/gen/js/js.v
index ae36805002..00d8e32bf2 100644
--- a/vlib/v/gen/js/js.v
+++ b/vlib/v/gen/js/js.v
@@ -468,7 +468,7 @@ pub fn (mut g JsGen) init() {
 		g.definitions.writeln('}')
 
 		g.definitions.writeln('const \$os = {')
-		g.definitions.writeln('  endianess: "LE",')
+		g.definitions.writeln('  endianness: "LE",')
 		g.definitions.writeln('}')
 	} else {
 		g.definitions.writeln('const \$os = require("os");')